Abstract

GODOY-LOZADA, Donovan  and  PELAEZ-RODRIGUEZ, Marlon. Diversity and distribution of the phytoperiphytic community present in an Andean Amazonian river and its relationship with environmental variables. Rev. acad. colomb. cienc. exact. fis. nat. [online]. 2020, vol.44, n.171, pp.437-451.  Epub June 10, 2021. ISSN 0370-3908.  https://doi.org/10.18257/raccefyn.1098.

In the present study, we evaluated the diversity and distribution of the phytoperiphytic community of the Hacha River, an Andean-Amazonian river in the Florencia (Caquetá) associated with a rocky substrate in four stations along the altitudinal gradient of the river during periods of high and low precipitation. In each season, we analyzed the spatial variation of the composition and the abundance of the phytoperiphyton, as well as the environmental factors that may be responsible for this variation, contrasting them through various tests, an Anova, and management analysis. We registered an increasing gradient downstream of temperature, turbidity, and biological demand for oxygen and ammonium, as well as decreasing values of dissolved oxygen from the highest altitudes to the lowest during the two periods analyzed. The turbidity, temperature, and conductivity variables positively influenced biomass and ammonia abundance. The Shannon index presented a significant inverse relationship with the biological oxygen demand and ammonia, and a positive one with pH and dissolved oxygen. The Bacillariophyceae class had the highest altitudinal distribution and stations A1 and A2 presented the greatest phytoperiphytic diversity among samplings. The Puente López station (A4) registered the lowest richness and high values of biological demand of oxygen and ammonium in the two sampling periods.

Keywords : Phytoperifiton; Diversity; Biomass; Distribution; Hacha River.

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